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Top 10 Malware of June 2017

The Top 10 Malware made up approximately 48% of new malware infections reported by the MS-ISAC in June, a decrease of five percentage points from May. This decline coincided with a 10% decrease in the number of Top 10 Malware notifications sent in June 2017 compared to May 2017. Every month the MS-ISAC maps the Top 10 Malware to infection vectors. This is done by using open source observations and reports on each malware type. The MS-ISAC observed a decrease in malspam in May, due to a drop in Kovter and Cerber notifications, while malvertising remained steady and dropped malware declined slightly.

Malware Amount June 2017

Malware Vector june 2017

The MS-ISAC Top 10 Malware refers to the top 10 new actionable event notifications of non-generic malware signatures sent out by the MS-ISAC Security Operations Center (SOC).

Dropped – Malware dropped by other malware already on the system or by an exploit kit.

Malvertising – Malware introduced through a malicious advertisement.

Malspam – Unsolicited emails, which either direct users to download malware from malicious web sites or trick the user into opening malware through an attachment.

Multiple – Refers to malware that currently favors at least two vectors.


  1. Kovter is a Trojan, which has been observed acting as click fraud malware or a ransomware downloader. It is disseminated via malspam email attachments containing malicious office macros. Kovter is fileless malware that evades detection by hiding in registry keys. Some reports indicate that Kovter infections have received updated instructions from command and control infrastructure to serve as a remote access backdoor.
  2. ZeuS/Zbot is a modular banking Trojan which uses keystroke logging to compromise victim credentials when the user visits a banking website. Since the release of the ZeuS/Zbot source code in 2011, many other malware variants have adopted parts of it’s codebase, which means that events classified as ZeuS/Zbot may actually be other malware using parts of the ZeuS/Zbot code.
  3. Ursnif and its variant Dreambot, are banking Trojans known for weaponizing Word documents. Ursnif uses web injection to collect victim information from login pages and web forms. Ursnif is currently being delivered via malspam.
  4. DNSChanger is malware that was very prolific in the late 2000s and early 2010s, before being dismantled by an FBI takedown. A new variant was identified in December 2017, which reportedly acts as an exploit kit targeting routers. Once infected, the routers’ DNS records are modified to point to a malicious server. DNSChanger is disseminated via malvertising and uses steganography to obfuscate its initial actions.
  5. Ponmocup is a downloader associated with one of the largest and longest running botnets, active since 2006. Ponmocup is usually disseminated through an infected webpage as a malvertisement.
  6. Emotet is a malware banking variant that uses malicious macros with either malicious embedded links or attachments. Emotet is in the same family of malware as Dridex and was regionally isolated in Europe around Germany. In early-April 2017, a campaign targeted the United Kingdom (U.K.) before surfacing in the United States (U.S.) in mid-April 2017. Emotet is disseminated via malspam campaigns. Recent Emotet campaigns paired with Pinkslipbot.
  7. PCRat/Gh0st is a remote access Trojan used to control infected endpoints. PCRat is dropped by other malware to create a backdoor into a device to allow an attacker to fully control the infected device.
  8. Hancitor is downloader malware disseminated via phishing emails containing a malicious macro attachment and is known to obfuscate itself using PowerShell commands.
  9. Tinba, also known as Tiny Banker, is a banking Trojan, known for its small file size. Tinba uses web injection to collect victim information from login pages and web forms, and is primarily disseminated via spam containing a weaponized PowerPoint file.
  10. Virlock is a polymorphic ransomware virus that was first discovered in December 2014, and referred to as Operation Global III. Virlock is considered a virus because it not only encrypts files, but copies the file and creates an .exe version next to it that is loaded with the virus. This increases the chances of users spreading the virus. The most recent version can also spread through cloud sync, cloud storage, and collaboration applications.